/*
 * Copyright 2018 NAVER Corp.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package com.navercorp.pinpoint.profiler.monitor.metric.directbuffer;

/**
 * @author Roy Kim
 */
public interface DirectBufferMetric {

    long UNCOLLECTED_VALUE = -1L;

    DirectBufferMetric UNSUPPORTED_DIRECT_BUFFER_METRIC = new DirectBufferMetric() {

        private final DirectBufferMetricSnapshot uncollectedSnapshot = new DirectBufferMetricSnapshot(UNCOLLECTED_VALUE, UNCOLLECTED_VALUE, UNCOLLECTED_VALUE, UNCOLLECTED_VALUE);

        @Override
        public DirectBufferMetricSnapshot getSnapshot() {
            return uncollectedSnapshot;
        }

        @Override
        public String toString() {
            return "Unsupported DirectBufferMetric";
        }
    };

    DirectBufferMetricSnapshot getSnapshot();
}
